Organic-inorganic hybrid mesoporous silica material modified by sulfonic acid group for selective adsorption of metal ions and method of manufacturing the same

Abstract

A silica precursor having a selective adsorptivity with respect to cobalt ions is disclosed. The silica precursor includes a cross-linked 2,6-diamino pyridine group obtained by using 2,6-diamino pyridine, phosgene and 3-aminopropyltriethoxysilane.

What is claimed is: 
     
       1. An organic-inorganic hybrid mesoporous silica material manufactured by using an organic-inorganic hybrid silica precursor and an alkoxy silica source as constituting materials of a porous wall, and a three-element copolymer as a template material for forming a structure, and by performing a self assembling method and a hydrothermal reaction,
 wherein said organic-inorganic hybrid silica precursor is prepared from 2,6-diamino pyridine, phosgene, and a silane compound including a functionalized amino group, the organic-inorganic hybrid silica precursor having the following chemical formula: 
 
       
         
           
           
               
               
           
         
       
     
     
       2. The organic-inorganic hybrid silica precursor of  claim 1 , wherein the silane compound is 3-aminopropyltriethoxysilane. 
     
     
       3. The organic-inorganic hybrid mesoporous silica material of  claim 1 , wherein a 2,6-diamino pyridine group cross-linked to an inner portion of the porous wall is modified by using a sulfonic acid group. 
     
     
       4. The organic-inorganic hybrid mesoporous silica material of  claim 3 , wherein the modification is performed by using chlorosulfonic acid and triethyl amine (Et3N). 
     
     
       5. An organic-inorganic hybrid mesoporous adsorbing agent, having a selective adsorptivity on specific metal ions, the adsorbing agent being obtained by modifying a surface of pores of the organic-inorganic hybrid mesoporous silica material of  claim 1  by a sulfonic acid group through adding chlorosulfonic acid to the organic-inorganic hybrid mesoporous silica material and then treating using triethylamine (Et3N). 
     
     
       6. The organic-inorganic hybrid mesoporous adsorbing agent of  claim 5 , wherein the specific metal ion includes a cobalt ion (Co2+). 
     
     
       7. The organic-inorganic hybrid mesoporous adsorbing agent of  claim 6 , wherein the selective adsorptivity on the cobalt ion (Co2+) is about 96% or over. 
     
     
       8. The organic-inorganic hybrid mesoporous adsorbing agent of  claim 5 , wherein a mixing ratio of the silica precursor based on the alkoxy silicon source is about 6%. 
     
     
       9. A method of manufacturing an organic-inorganic hybrid mesoporous adsorbing agent, the method comprising:
 forming a silica precursor including a cross-linked 2,6-diamino pyridine group by using 2,6-diamino pyridine, phosgene and 3-aminopropyltriethoxysilane; 
 forming a silica/template hybrid including a cross-linked 2,6-diamino pyridine group by mixing a template for forming a structure of an organic material, with a silica precursor and tetraethyl orthosilicate (TEOS); 
 removing the template from the silica/template hybrid and forming an organic-inorganic hybrid mesoporous silica material; and 
 modifying the surface of pores of the organic-inorganic hybrid mesoporous silica material by using a sulfonic acid group. 
 
     
     
       10. The method of  claim 9 , wherein a mixing ratio of the silica precursor based on tetraethyl orthosilicate is about 6%.